[Buildroot] [PATCH] core: detect and reject build paths which contain an '@'

Yann E. MORIN yann.morin.1998 at free.fr
Mon Aug 20 20:49:53 UTC 2018


gcc does not build when the srcdir path contains a '@', because that
path is then substitued in a texi file as argument to an @include
directive. But then, the '@' in the path will start a command evaluation
of its own, thus breaking the build. For example, with a $(O) path set
to /home/ymorin/dev/buildroot/O/to at ti :

    perl ../../gcc/../contrib/texi2pod.pl ../../gcc/doc/invoke.texi > gcc.pod
    ../../gcc/doc/invoke.texi:1678: unknown command `ti'
    ../../gcc/doc/invoke.texi:1678: @include: could not find /home/ymorin/dev/buildroot/O/to/build/host-gcc-initial-7.3.0/build/gcc/../../gcc/../libiberty/at-file.texi

Reported-by: c32 on IRC
Signed-off-by: "Yann E. MORIN" <yann.morin.1998 at free.fr>
---
 Makefile | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Makefile b/Makefile
index d1ee9293a2..8a2b614b81 100644
--- a/Makefile
+++ b/Makefile
@@ -60,6 +60,11 @@ override O := $(patsubst %/,%,$(patsubst %.,%,$(O)))
 # avoid empty CANONICAL_O in case on non-existing entry.
 CANONICAL_O := $(shell mkdir -p $(O) >/dev/null 2>&1)$(realpath $(O))
 
+# gcc fails to build when the srcdir contains a '@'
+ifneq ($(CANONICAL_O),$(subst @,,$(CANONICAL_O)))
+$(error The build directory can not contain a '@')
+endif
+
 CANONICAL_CURDIR = $(realpath $(CURDIR))
 
 REQ_UMASK = 0022
-- 
2.14.1



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