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core: detect and reject build paths which contain an '@'

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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@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

[Peter: use findstring instead of subst/compare]
Reported-by: c32 on IRC
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Yann E. MORIN 2018-08-20 22:49:53 +02:00 committed by Peter Korsgaard
parent 4313544486
commit 7007dc2bc9
1 changed files with 5 additions and 0 deletions
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5
Makefile
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@ -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 $(O))
# gcc fails to build when the srcdir contains a '@'
ifneq ($(findstring @,$(CANONICAL_O)),)
$(error The build directory can not contain a '@')
endif
CANONICAL_CURDIR = $(realpath $(CURDIR))
REQ_UMASK = 0022