[Crash-utility] Re: [PATCH v2] Use CC env var to get compiler version

Hello Lianbo Thanks for your review. In the patch, we don't expect the CC env to be always defined, this is tested with "if(NULL == cc_env)", in the case it is not defined, we retrieve the compiler version like it was done before with a call to "gcc --version" and if it is defined we replace "gcc" by the content of CC env variable (binary to the compiler actually used for compilation, not necessarily the native gcc installed on the host machine). I have looked at GDB_CONF_FLAGS, but from what I understand ,it defines the target architecture (arm, x86, MIPS...) not the compiler version:

#define GDB_TARGET_DEFAULT "GDB_CONF_FLAGS=" #define GDB_TARGET_ARM_ON_X86 "GDB_CONF_FLAGS=--target=arm-elf-linux" #define GDB_TARGET_ARM_ON_X86_64 "GDB_CONF_FLAGS=--target=arm-elf-linux CFLAGS=-m32 CXXFLAGS=-m32" #define GDB_TARGET_X86_ON_X86_64 "GDB_CONF_FLAGS=--target=i686-pc-linux-gnu CFLAGS=-m32 CXXFLAGS=-m32" #define GDB_TARGET_PPC_ON_PPC64 "GDB_CONF_FLAGS=--target=ppc-elf-linux CFLAGS=-m32 CXXFLAGS=-m32" #define GDB_TARGET_ARM64_ON_X86_64 "GDB_CONF_FLAGS=--target=aarch64-elf-linux" /* TBD */ #define GDB_TARGET_PPC64_ON_X86_64 "GDB_CONF_FLAGS=--target=powerpc64le-unknown-linux-gnu" #define GDB_TARGET_MIPS_ON_X86 "GDB_CONF_FLAGS=--target=mipsel-elf-linux" #define GDB_TARGET_MIPS_ON_X86_64 "GDB_CONF_FLAGS=--target=mipsel-elf-linux CFLAGS=-m32 CXXFLAGS=-m32" #define GDB_TARGET_RISCV64_ON_X86_64 "GDB_CONF_FLAGS=--target=riscv64-unknown-linux-gnu" #define GDB_TARGET_LOONGARCH64_ON_X86_64 "GDB_CONF_FLAGS=--target=loongarch64-unknown-linux-gnu" The end result of this patch is to correct the value of variable "char *compiler_version" defined in generated file build_data.c, this value depends on the compiler used in compilation. Examples: - When building with the native gcc compiler install on my host machine running with Ubuntu: char *compiler_version = "gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0" - When building with the generated compiler (not the native gcc) used on the Yocto project for a x86 machine: char *compiler_version = "x86_64-poky-linux-gcc (GCC) 15.1.0"; - When building with the native gcc compiler install on a host machine running with a Red Hat system: char·*compiler_version·=·"gcc·(GCC)·11.4.1·20231218·(Red·Hat·11.4.1-3)"; Best regards Kéléfa Sané On Fri, May 30, 2025 at 10:19 AM lijiang <lijiang(a)redhat.com&gt; wrote: > Hi, Kéléfa Sané > Thank you for the patch. > > On Mon, May 26, 2025 at 5:04 PM < > devel-request(a)lists.crash-utility.osci.io&gt; wrote: > >> Date: Mon, 26 May 2025 11:03:24 +0200 >> From: kelefa.sane(a)smile.fr >> Subject: [Crash-utility] [meta-oe][PATCH v2] Use CC env var to get >> compiler version >> To: devel(a)lists.crash-utility.osci.io >> Cc: Kéléfa Sané <kelefa.sane(a)smile.fr&gt; >> Message-ID: <20250526090324.3113589-1-kelefa.sane(a)smile.fr&gt; >> Content-Type: text/plain; charset=UTF-8 >> >> From: Kéléfa Sané <kelefa.sane(a)smile.fr&gt; >> >> The source file build_data.c generated at compilation time define a >> variable compiler_version which is obtained by calling "gcc --version" >> cmd. This call retrieve the native gcc compiler install on host build >> machine but not necessarily the compiler use to build the project (ex: >> cross compilation). >> > > Good findings. > > >> >> The CC env variable commonly used in Makefile project define the >> compiler to use at build, so this is the appropriate way to retrieve the >> compiler version, when the CC env var is define. >> > > If the CC env variable is not set, this is still a problem. We should > not expect that the CC env variable is always defined(or set). > > I would suggest parsing the GDB_CONF_FLAGS to get the target gcc version, > which is visible in the configure.c > > What do you think? > > Thanks > Lianbo > > >> Signed-off-by: Kéléfa Sané <kelefa.sane(a)smile.fr&gt; >> --- >> configure.c | 12 +++++++++++- >> 1 file changed, 11 insertions(+), 1 deletion(-) >> >> diff --git a/configure.c b/configure.c >> index 4668c9a..4b65bd7 100644 >> --- a/configure.c >> +++ b/configure.c >> @@ -1362,7 +1362,17 @@ make_build_data(char *target) >> >> fp1 = popen("date", "r"); >> fp2 = popen("id", "r"); >> - fp3 = popen("gcc --version", "r"); >> + >> + const char *cc_env = getenv("CC"); >> + if(NULL == cc_env) { >> + fp3 = popen("gcc --version", "r"); >> + } >> + else { >> + char compiler_version_cmd[512]; >> + >> + snprintf(compiler_version_cmd, >> sizeof(compiler_version_cmd), "%s --version", cc_env); >> + fp3 = popen(compiler_version_cmd, "r"); >> + } >> >> if ((fp4 = fopen("build_data.c", "w")) == NULL) { >> perror("build_data.c"); >> >> >> >>