From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt Weber Date: Thu, 11 Mar 2021 08:29:30 -0600 Subject: [Buildroot] [PATCH v11 7/9] package/clang: help host-clang to find our external toolchain In-Reply-To: <20210311142932.44985-1-matthew.weber@rockwellcollins.com> References: <20210311142932.44985-1-matthew.weber@rockwellcollins.com> Message-ID: <20210311142932.44985-7-matthew.weber@rockwellcollins.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net From: Romain Naour To build libfuzzer package Matthew Weber noticed that (host) clang doesn't run on the host without "-B $(HOST_DIR)/opt/ext-toolchain" option. This option add a new search path for binaries and object files used implicitly. Without -B clang fail to link due to missing crtbeging.o file and libgcc: output/host/bin/aarch64-linux-gnu-ld: cannot find crtbegin.o: No such file or directory output/host/bin/aarch64-linux-gnu-ld: cannot find -lgcc Indeed, clang search path doesn't include the dafault cross-gcc's search paths: $ output/host/bin/clang -print-search-dirs programs: = output/host/bin:output/host/bin:/..//bin libraries: = output/host/lib/clang/8.0.0: output/host/bin/../lib64: /lib/../lib64: /usr/lib/../lib64: output/host/bin/../lib: /lib:/usr/lib Here is the same command for cross-gcc: $ output/host/bin/aarch64-linux-gnu-gcc -print-search-dirs install: output/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/ programs: = output/host/opt/ext-toolchain/bin/../libexec/gcc/aarch64-linux-gnu/8.3.0/: output/host/opt/ext-toolchain/bin/../libexec/gcc/: output/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/../../../../aarch64-linux-gnu/bin/aarch64-linux-gnu/8.3.0/: output/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/../../../../aarch64-linux-gnu/bin/ libraries: = output/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/: output/host/opt/ext-toolchain/bin/../lib/gcc/: output/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/../../../../aarch64-linux-gnu/lib/aarch64-linux-gnu/8.3.0/: output/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/../../../../aarch64-linux-gnu/lib/../lib64/: output/host/aarch64-buildroot-linux-gnu/sysroot/lib/aarch64-linux-gnu/8.3.0/: output/host/aarch64-buildroot-linux-gnu/sysroot/lib/../lib64/: output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/aarch64-linux-gnu/8.3.0/: output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/../lib64/: output/host/opt/ext-toolchain/bin/../lib/gcc/aarch64-linux-gnu/8.3.0/../../../../aarch64-linux-gnu/lib/: output/host/aarch64-buildroot-linux-gnu/sysroot/lib/: output/host/aarch64-buildroot-linux-gnu/sysroot/usr/lib/ We can see that gcc default search path contains "output/host/opt/ext-toolchain" directory where the external toolchain has been extracted. Since we want to use clang without additional option like -B, patch clang in order to use GCC_INSTALL_PREFIX instead of using automatic detection (which doesn't work for Buildroot). We eventually want to relocate the Buildroot SDK containing the clang cross-compiler, so we provide a relative path to GCC_INSTALL_PREFIX in order to avoid to hardcode the path to the GCC toolchain. Also the path between clang and the GCC external toolchain is not always the same, we have the following case: * Toolchain to be downloaded and installed The toolchain is extracted into $(HOST_DIR)/opt/ext-toolchain, so the path is "../opt/ext-toolchain". * Pre-installed toolchain The toolchain is localed somewhere in the host filesystem and defined by the user using BR2_TOOLCHAIN_EXTERNAL_PATH. So, set GCC_INSTALL_PREFIX using realpath: -DGCC_INSTALL_PREFIX:PATH=`realpath --relative-to=$(HOST_DIR)/bin/ $(TOOLCHAIN_EXTERNAL_INSTALL_DIR)` When we use a Buildroot's internal toolchain, clang will find theses crt*.o files and libgcc. http://lists.busybox.net/pipermail/buildroot/2019-August/256204.html Signed-off-by: Romain Naour Cc: Matthew Weber Cc: Valentin Korenblit Tested-by: Matt Weber --- Changes v1 -> v2 [Arnout - Can't dropped ":PATH" from "-DGCC_INSTALL_PREFIX:PATH=" as suggested, The string isn't set correctly and results in "cannot find crtbegin.o" - Attempting to post patch upstream - I did not address the relative vs absolute path comment. The current approach seemed correct per my understanding for handling the two toolchain install location cases --- ...hains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch | 78 +++++++++++++++++++ package/clang/clang.mk | 7 ++ 2 files changed, 85 insertions(+) create mode 100644 package/clang/0001-lib-Driver-ToolChains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch diff --git a/package/clang/0001-lib-Driver-ToolChains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch b/package/clang/0001-lib-Driver-ToolChains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch new file mode 100644 index 0000000000..08371154d5 --- /dev/null +++ b/package/clang/0001-lib-Driver-ToolChains-Gnu-Use-GCC_INSTALL_PREFIX-in-.patch @@ -0,0 +1,78 @@ +From fe21cede3939a435d62efbd5799547fab6af1b0a Mon Sep 17 00:00:00 2001 +From: Romain Naour +Date: Mon, 5 Aug 2019 16:06:48 +0200 +Subject: [PATCH] lib/Driver/ToolChains/Gnu: Use GCC_INSTALL_PREFIX in the set + of prefixes for searching the gcc toolchain + +By default, the Gnu Toolchains driver is looking at the parent +directory while looking for the gcc toolchain when clang is installed +at "D.InstalledDir" + +But this doesn't work with Buildroot since the external +toolchain is installed in host/opt/ext-toolchain and the sysroot is +moved to host/-buildroot-linux-gnu/sysroot/ directory. + +We tried by setting GCC_INSTALL_PREFIX in clang.mk for host-clang +but it doesn't work since we already provide a sysroot [1]. + +Help the Gnu Toolchains driver by using GCC_INSTALL_PREFIX path. + +Since we want to be able to relocate the clang toolchain, +allow to use a relative path with GCC_INSTALL_PREFIX. + +Buildroot will provide such relative path by using: +HOST_CLANG_CONF_OPTS += -DGCC_INSTALL_PREFIX:PATH=`realpath --relative-to=$(HOST_DIR)/bin/ $(TOOLCHAIN_EXTERNAL_INSTALL_DIR)` + +Doing so allow to use clang without providing additional search +paths with -B option on the clang's command line. + +[1] https://reviews.llvm.org/D49244 +[2] http://lists.busybox.net/pipermail/buildroot/2019-August/256204.html + +Signed-off-by: Romain Naour +Signed-off-by: Matthew Weber +--- +Pending, access to llvm mailing lists to submit it is pending. They +seem to be having issues with their listserv. +--- + lib/Driver/ToolChains/Gnu.cpp | 17 +++++++++++++++++ + 1 file changed, 17 insertions(+) + +diff --git a/lib/Driver/ToolChains/Gnu.cpp b/lib/Driver/ToolChains/Gnu.cpp +index 2ad45097dc..90d6b5b748 100644 +--- a/lib/Driver/ToolChains/Gnu.cpp ++++ b/lib/Driver/ToolChains/Gnu.cpp +@@ -1725,6 +1725,8 @@ void Generic_GCC::GCCInstallationDetector::init( + + Prefixes.push_back(GCCToolchainDir); + } else { ++ StringRef GccIinstallPrefix = GCC_INSTALL_PREFIX; ++ + // If we have a SysRoot, try that first. + if (!D.SysRoot.empty()) { + Prefixes.push_back(D.SysRoot); +@@ -1734,6 +1736,21 @@ void Generic_GCC::GCCInstallationDetector::init( + // Then look for gcc installed alongside clang. + Prefixes.push_back(D.InstalledDir + "/.."); + ++ // Use GCC_INSTALL_PREFIX if provided by the buildsystem. ++ if (!GccIinstallPrefix.empty()) ++ { ++ if (llvm::sys::path::is_relative(GccIinstallPrefix)) ++ { ++ // Use a relative path to gcc from clang install path. ++ Prefixes.push_back(D.InstalledDir + "/" + GccIinstallPrefix.str()); ++ } ++ else ++ { ++ // Hardcode the absolute path provided by GCC_INSTALL_PREFIX. ++ Prefixes.push_back(GCC_INSTALL_PREFIX); ++ } ++ } ++ + // Next, look for prefix(es) that correspond to distribution-supplied gcc + // installations. + if (D.SysRoot.empty()) { +-- +2.20.1 + diff --git a/package/clang/clang.mk b/package/clang/clang.mk index d1667d79b6..95b4964be3 100644 --- a/package/clang/clang.mk +++ b/package/clang/clang.mk @@ -105,5 +105,12 @@ CLANG_CONF_OPTS += -DLLVM_LINK_LLVM_DYLIB=ON HOST_CLANG_CONF_OPTS += -DLLVM_DYLIB_COMPONENTS=all CLANG_CONF_OPTS += -DLLVM_DYLIB_COMPONENTS=all +# Help host-clang to find our external toolchain, use a relative path from the clang +# installation directory to the external toolchain installation directory in order to +# not hardcode the toolchain absolute path. +ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y) +HOST_CLANG_CONF_OPTS += -DGCC_INSTALL_PREFIX:PATH=`realpath --relative-to=$(HOST_DIR)/bin/ $(TOOLCHAIN_EXTERNAL_INSTALL_DIR)` +endif + $(eval $(cmake-package)) $(eval $(host-cmake-package)) -- 2.17.1