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Upstream only test with Bison and require GNUisms like YYEOF and
YYERRCODE. The former at least may be in POSIX soon:
https://www.austingroupbugs.net/view.php?id=1269.
configure warns on use of non-Bison but doesn't abort. The result
may misbehave at runtime.
Noticed with recently added bash-5.2_p15-shell-parser-reset-issue.patch
(which is blameless in itself).
A simple test with a broken Bash is:
```
$ /var/tmp/portage/app-shells/bash-5.2_p15-r4/image/bin/bash -n /lib/gentoo/functions.sh
/lib/gentoo/functions.sh: line 104: syntax error near unexpected token `}'
/lib/gentoo/functions.sh: line 104: `}'
```
Reference: 3ee2d707a299f352b6970af459b0c25c356cbb25
Reference: dde3a81f420e745fe884b6535796129192f02561
Signed-off-by: Sam James <sam@gentoo.org>
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Thanks to radhermit's new pkgcraft tooling. Also, thanks to ztrawhcse for suggestions.
Before:
```
app-shells/bash-5.2_p15-r3::.: 61.224122ms
app-shells/bash-5.1_p16-r4::.: 65.001125ms
app-shells/bash-5.1_p16-r5::.: 65.480029ms
```
After:
```
app-shells/bash-5.2_p15-r3::/home/sam/g/: 10.449073ms
app-shells/bash-5.1_p16-r4::/home/sam/g/: 10.505063ms
app-shells/bash-5.1_p16-r5::/home/sam/g/: 10.523583ms
```
This also gets us to approximately the same speed (almost within rounding
error) of pre-d3c19b7974aeb4ac2a1351a019e80625b4111c4b (where we removed eval
usage).
Signed-off-by: Sam James <sam@gentoo.org>
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Signed-off-by: Fabian Groffen <grobian@gentoo.org>
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Signed-off-by: Fabian Groffen <grobian@gentoo.org>
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Signed-off-by: Fabian Groffen <grobian@gentoo.org>
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Signed-off-by: Fabian Groffen <grobian@gentoo.org>
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Signed-off-by: David Seifert <soap@gentoo.org>
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