[buildroot-tips] 编译squashfs找不到get_nprocs出错

[issue]

squashfs最后连接时找不到get_nprocs()，这个接口不包含在uClibc中。

unsquashfs.o: In function `initialise_threads’:

unsquashfs.c:(.text+0xb27): undefined reference to `get_nprocs’

collect2: ld returned 1 exit status

…

 

[analysis]

get_nprocs()可以直接用sysconf(_SC_NPROCESSORS_CONF)来实现。

 

[resolution]

修改squashfs-tools/mksquashfs.c和unsquashfs.c，用sysconf(_SC_NPROCESSOR_CONF)替代get_nprocs();

 

diff --git a/package/squashfs/squashfs-4.0-mksquashfs-get_nprocs.patch b/package/squashfs/squashfs-4.0-mksquashfs-get_nprocs.patch new file mode 100644 index 0000000..8a19923 --- /dev/null +++ b/package/squashfs/squashfs-4.0-mksquashfs-get_nprocs.patch @@ -0,0 +1,37 @@ +[PATCH] squashfs-tools: Don't use get_nprocs() + +get_nprocs() is a GNU extension, not supported on E.G. uClibc. It is a +simple wrapper around sysconf(_SC_NPROCESSORS_CONF), so use that instead. + +Signed-off-by: Peter Korsgaard <> +--- + squashfs-tools/mksquashfs.c | 2 +- + squashfs-tools/unsquashfs.c | 2 +- + 2 files changed, 2 insertions(+), 2 deletions(-) + +Index: squashfs4.0/squashfs-tools/mksquashfs.c +=================================================================== +--- squashfs4.0.orig/squashfs-tools/mksquashfs.c ++++ squashfs4.0/squashfs-tools/mksquashfs.c +@@ -3705,7 +3705,7 @@ void initialise_threads() + processors = 1; + } + #else +- processors = get_nprocs(); ++ processors = sysconf(_SC_NPROCESSORS_CONF); + #endif + } + +Index: squashfs4.0/squashfs-tools/unsquashfs.c +=================================================================== +--- squashfs4.0.orig/squashfs-tools/unsquashfs.c ++++ squashfs4.0/squashfs-tools/unsquashfs.c +@@ -1811,7 +1811,7 @@ void initialise_threads(int fragment_buf + processors = 1; + } + #else +- processors = get_nprocs(); ++ processors = sysconf(_SC_NPROCESSORS_CONF); + #endif + } +

 

[reference]

[1].